Coligh’s Standard 844nm Optical Longpass Filter

The 844nm optical longpass filter is designed to transmit infrared light above 844nm while effectively blocking shorter wavelengths. This high-performance filter is tailored for applications requiring precise wavelength control in the near-infrared (NIR) range, offering excellent transmission efficiency and blocking depth.

---

Standard Specifications:

• Type: NIR Longpass Filter, Interference Filter
• Coating Type: Hard-coated for durability and long-term stability
• Cut-on Wavelength (CWL): 844nm ± 5nm
• Angle of Incidence: 0° ± 5°
• Blocking Range: 400-830nm
• Blocking Depth: OD2-OD3 or higher for strong suppression of shorter wavelengths
• Transmission Range: > 90% above 844nm
• Thickness: 1.0mm, 1.1mm
• Sizes Available: φ12.5mm, φ25.4mm, φ50mm, square formats, or custom sizes upon request
• Clear Aperture: > 90%
• Material: B270, Fused Silica for superior optical quality and minimal absorption

---

Custom Options:

• Cut-on Wavelength: Adjustable for alternative NIR thresholds
• Angle of Incidence: Configurable to optimize performance for tilted applications
• Blocking Depth: Customizable OD levels (e.g., OD3, OD4, OD5, etc.)
• Sizes: Round or square formats up to 150mm x 150mm
• Material Thickness: Tailored to fit specific system requirements
• Transmission & Blocking Range: Adaptable for applications requiring broader or narrower ranges (200nm – 2000nm)

---

Applications:

• Infrared Imaging: Enhances sensitivity and contrast by isolating IR wavelengths.
• Spectroscopy: Provides precise wavelength separation for accurate analysis.
• Optical Communication: Facilitates wavelength-specific transmission in NIR systems.
• Laser Systems: Isolates IR laser wavelengths for precision applications.
• Machine Vision: Improves performance in IR-sensitive inspection systems.
• Astronomy and Remote Sensing: Ideal for capturing IR light in celestial or terrestrial studies.
• Biomedical Imaging: Enhances IR-specific imaging for diagnostics and research.